Direct Digital Amplifiers

I am very excited about the concept of direct digital amplifiers, such as the NAD M2 and the new NuForce DDA-100. There are others coming out too. I would think these amps are in their infancy. I would like to know if anyone has had direct experience with them and what are your impressions. I would like to see them accessible to digital equalization. Are there any models that incorporate this functionality?